Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b6958dd7ece303…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 05:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a60e27fe7db7424a6b543cb296428b20 SHA-1: 5f8949e956e1cd3224d946729f8dc0fa949d5291 SHA-256: 71b6958dd7ece303afbd29c63f107640bb1092cb35d7c2a1216091d7648002ca
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. ClamAV detection as 'Pdf.Phishing.Trojan' further indicates malicious intent. The file likely serves as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://clingac.com/d/files/wefase.pdf In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/buvotodujixovimemakiwiwog.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/36776437126.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/6061435925.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee86c078a---gufeteselopepozusetatodi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324863a950c---38372317640.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/56932286975.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bee53f5e7---jegododijidexek.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/fowabupaleroxopeb.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/xetagemosezovaw.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/kefujajuzo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/he30jspfjf5vapiovj56qganmj/zufunoxinapozima.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/giberurozuv.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jotegupanojade.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/148d11adcb62d1634191c4cbaf95d8c9/60366099255.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/benularuwajitesavutopebun.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/24045600741.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/36847775875.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/gobamiropi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/xavin.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0b974b6---zixusuvuzafibonu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/83461541865.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/puraxaborulevaxakexevig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chemistry+zumdahl+8th+edition+textbook+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 11696 bytes
SHA-256: 0562db028bf6f1be3fe904cb0f86254e7d87622841938b7a50fdeba191e1ac62